Cadillac SLS Oxygen Sensor

I Have A Warning Light That Comes On When Hooked Up To One Of Those Hand Held Code Readers It Says That It's An O2 Sensor. Can't Remember...

Obd2 Scanner Brings Up Po171andpo174saying The Car Is Running Lean.i Check Fuel Injectors For Leaking And Clogged They Seem To Be O.k.if It...

I Checked The Ground Circuit For O2 Sensor Heaters, It Is Ok Till I Turn On The Ing Switch Then I Loose The Ground

Code Reader Says P0147. Haynes Manual Says Bank 1 Sensor 3. I Cannot Figure Out Reading The Manuel Which O2. The One Up Front The One At...